Q5. tom buys three cds and two dvds.
write down an expression for the cost of tom's shopping.
use c for the cost of one cd and d for the cost of one dvd.

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- Let's recap the basics first:

An expression is something that doesn't equal to anything

For example '2j' is an expression

In this case, the expression would be simply be 3c + 2d

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- Ally ✧

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to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk

1 number

if we use a graphing calculator, there is only one such number that satisfies the conclusion of the mean value theorem, that is, a number such that

where the right-hand side is the average rate of change of f on the interval [0.5,0.75], which is the slope of the secant line.

in the attached graph, the black line is the secant line which has its slope as the average rate of change of f on [0.5,0.75], while the orange line is the only tangent line to the graph of f in the interval that satisfies the mvt conclusion.